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How to quickly access shared Exchange On-Premise mailboxes after migration to Exchange Online using a web browser

It is possible to access shared mailboxes still on Exchange On-Premise (i.e. not yet migrated to Exchange Online) using a web browser, provided that you have Full Access to the mailbox using your original ACN account.
  1. In a web browser, browse to the shared Exchange On Premise mailbox you want to open using the URL in this format:

    Replace "" with the email address of the mailbox you want to open.

  2. Log in using your ACN credentials:

    Username = CRSid
    Password = your ACN password